<template>
    <div>
        <!-- 顶部滑动条 -->
        <div id="slider" class="mui-slider">
            <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                <div class="mui-scroll">
                    <a :class="['mui-control-item',item.id == 0 ? 'mui-active':'']"
                                 v-for="item in cates" :key="item.id" 
                                 @tap="getPhotoListById(item.id)">  <!-- mui中的tap -->
                        
                        {{item.title}}
                    </a>
                </div>
            </div>
        </div>

        <!-- 图片列表区域 -->
        <div>
            <ul class="photo-list">
                <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/' + 
                item.id" tag="li">
                    <img v-lazy="item.img_url">
                    <div class="info">
                        <h1 class="info-title">{{ item.title }}</h1>
                        <div class="info-body">{{ item.summary }}</div>
                    </div>
                </router-link>
            </ul>
        </div>

    </div>
</template>
<script>
//1.导入mui
import mui from '../../lib/mui/js/mui.min.js'

export default {
    data(){
        return {
            cates:[],   //所有分类列表数组
            list:[]     //图片列表的数组
        }
    },
    created(){
        this.getAllCategory()
        this.getPhotoListById(0)
    },
    mounted(){
        //当组件中的DOM结构被渲染好并放到页面中后，会执行这个 钩子函数
        //如果要操作元素了，最好在 mounted 里面，因为，这时候的DOM元素 是最新的
        //2.初始化滑动控件
        mui('.mui-scroll-wrapper').scroll({     
            deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
        });
    },
    methods:{
        getAllCategory(){
            //获取所有的图片分类
            this.$http.get("picturelist.json").then(result => {
                if(result.body.status === 0){
                    //手动拼接出一个最完整的分类列表
                    result.body.message.unshift({title:"全部",id:0})
                    this.cates = result.body.message
                }
            })
        },
        getPhotoListById(cateId){
            //根据分类id，获取图片列表
            this.$http.get("picture"+cateId+".json").then(
                
                result => {
                    if(result.body.status === 0){
                        this.list = result.body.message
                    }
                },result => {
                    this.list = 0;
                })
        }
    }
}
</script>
<style lang="scss" scoped>
* {
    //滑动时候报警
    touch-action:pan-y  //解除chrome浏览器警报
}
.photo-list{
    list-style:none;
    margin:0;
    padding: 10px;
    padding-bottom:0;
    li{
        background-color: #ccc;
        text-align:center;
        margin-bottom: 10px;
        box-shadow:0 0 6px #999;
        position: relative;
        img[lazy=loading] {
            width: 40px;
            height: 300px;
            margin: auto;
        }
        img{
            // width: 20%;
            // height:30%;
            width: 100%;
            height:100%;
            vertical-align: middle;
        }
    }

    .info{
        color:white;
        text-align: left;
        position: absolute;
        bottom:0;
        padding:0px 3px;
        background-color:rgba(0,0,0,0.4);
        max-height: 84px;
        .info-title{
            font-size: 14px;
        }
        .info-body{
            font-size: 13px;
        }
    }
}



</style>
